Review Request 128890: Make e.g. Baloo::Query thread safe.

[Christoph Cullmann]

> On Sept. 11, 2016, 6:32 p.m., Anthony Fieroni wrote:
> > src/engine/database.cpp, line 128
> > <https://git.reviewboard.kde.org/r/128890/diff/1/?file=476743#file476743line128>
> >
> >     It's needed *m_env = 0;*
> >     Or you can add method close to call it in all way.
> 
> Christoph Cullmann wrote:
>     I don't understand the comment ;)
>     1) m_env != null means valid atm, therefore I can call here close
>     2) after this, the destructor is over, no need to null it, if you access the database object after/during destruction, all is lost.
> 
> Anthony Fieroni wrote:
>     Missing m_env = 0 after closing call. It can lead crash it future use.

Ah ;=) I see, I misread the line!
Thanks


- Christoph


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On Sept. 11, 2016, 6:27 p.m., Christoph Cullmann wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/128890/
> -----------------------------------------------------------
> 
> (Updated Sept. 11, 2016, 6:27 p.m.)
> 
> 
> Review request for KDE Frameworks, Plasma and Boudhayan Gupta.
> 
> 
> Repository: baloo
> 
> 
> Description
> -------
> 
> lmdb itself is thread safe (e.g. you can use the same env in multiple threads).
> Unfortunately, the Baloo::Database itself not, as open() might race against other open calls (we have one unique db object in baloo).
> 
> => add non-recursive mutex (recursive mutex not needed, one just must avoid to call isOpen() or path() inside open, that is done, else no unit test works).
> 
> 
> Diffs
> -----
> 
>   src/engine/database.h e3bb175 
>   src/engine/database.cpp ec7ae2e 
> 
> Diff: https://git.reviewboard.kde.org/r/128890/diff/
> 
> 
> Testing
> -------
> 
> Unit tests still work.
> 
> 
> Thanks,
> 
> Christoph Cullmann
> 
>

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